Subkilohertz linewidth room-temperature mid-infrared quantum cascade laser using a molecular sub-Doppler reference

Year: 2012

Authors: Cappelli F., Galli I., Borri S., Giusfredi G., Cancio P., Mazzotti D., Montori A., Akikusa N., Yamanishi M., Bartalini S., De Natale P.

Autors Affiliation: CNR, INO – Istituto Nazionale di Ottica, Largo E. Fermi 6, Firenze 50125, Italy; LENS – European Laboratory for Non-linear Spectroscopy, Via Carrara 1, Sesto Fiorentino 50019, Italy; CNR, IFN – Istituto di Fotonica e Nanotecnologie, Via Amendola 173, Bari 70126, Italy; Development Bureau Laser Device R and D Group, Hamamatsu Photonics KK, Shizuoka 434-8601, Japan; Central Research Laboratories, Hamamatsu Photonics KK, Shizuoka 434-8601, Japan

Abstract: We report on the narrowing of a room-temperature mid-IR quantum cascade laser by frequency locking it to a CO2 sub-Doppler transition obtained by polarization spectroscopy. A locking bandwidth of 250 kHz has been achieved. The laser linewidth is narrowed by more than two orders of magnitude below 1 kHz, and its absolute frequency is stabilized at the same level. (C) 2012 Optical Society of America

Journal/Review: OPTICS LETTERS

Volume: 37 (23)      Pages from: 4811  to: 4813

More Information: This work was financially supported by Ente Cassa di Risparmio di Firenze, by Regione Toscana through the project CTOTUS in the framework of POR-CReO FESR 2007-2013, and by the ELI project funded by the Italian Ministry for University and Research. We finally thank P. Yzombard and D. Descloux for their valuable support in data collection and analysis.
KeyWords: Absolute frequency; Frequency locking; Laser line-width; Locking bandwidth; Mid-infrared quantum cascade; Orders of magnitude; Polarization spectroscopy; Room temperature, Carbon dioxide; Quantum cascade lasers, Lasers
DOI: 10.1364/OL.37.004811

Citations: 60
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